We are currently using TLV320AIC1110 part on our IPCC board.
We just had a build of 300 built. Out of that build we found a common problem with 10 of our boards TLV320AIC1110.
The problem is MIC2N pin of the microphone input has no signal, however when you lift the cap in series the signal is there. This always seems to happen on microphone input 2. The other microphone on the board works great.
We went on to replace the codec and the board is fixed.
Do you have any idea’s what this could be. The circuit is the same as what is illustrated in the app note.
Let me know what you think…
thanks
John